Separation and purification of platinum group metals

Platinum Group metals separation and purification of: a platinum group metal extraction and purification processes vary ingredients, the content varies. The platinum group metal concentrate or the anode mud containing the platinum group metal is dissolved in aqua regia, and palladium , platinum, and gold are all introduced into the solution. Treated with hydrochloric acid to destroy nitrosyl compound, then add ferrous sulfate precipitated gold. Ammonium chloride is added, platinum is precipitated as ammonium chloroplatinate, and calcined ammonium chloroplatinate can obtain sponge platinum containing more than 99.5% of platinum. After separating the platinum filtrate, an excessive amount of ammonium hydroxide is added, and then acidified with hydrochloric acid to precipitate palladium in the form of dichlorodiamine palladium, and then calcined in hydrogen to obtain a sponge palladium having a purity of 99.7% or more.

Platinum group metal separation and purification, by treatment of the rear king insolubles sodium carbonate, borax, litharge and coke eutectic, Degui lead. Remove most of the lead, then silver nitrate was dissolved by cupellation residual lead, rhodium, iridium, osmium, ruthenium enriched in the residue. The residue is melted with sodium hydrogen sulfate, converted into a soluble sulfate, leached with water, added with sodium hydroxide to precipitate barium hydroxide, and then dissolved with hydrochloric acid to obtain chlorodecanoic acid. After the solution is purified, ammonium chloride is added, and the ammonium chloroantimonate is crystallized and concentrated. Calcination in hydrogen gives a sponge.

Separation and purification of platinum group metals. When sodium hydrogen sulfate is melted, lanthanum, cerium and lanthanum do not react and remain in the water leaching residue. The residue is melted together with sodium peroxide and caustic soda, and leached with water; chlorine gas is introduced into the leachate and distilled, and hydrazine and hydrazine are distilled off as an oxide. After absorption with an ethanol-hydrochloric acid solution, the absorption liquid is heated and distilled again, and sodium citrate is obtained by absorption with an alkali solution. When ammonium chloride is added to the absorption liquid, the antimony is precipitated as an ammonium salt and calcined in hydrogen to obtain a crucible powder. Ammonium chloride is added to the residual liquid of the steamed mash to obtain an ammonium salt of cerium, which is then calcined in hydrogen to obtain cerium powder. The residue after leaching ruthenium and ruthenium is mainly ruthenium oxide, dissolved in aqua regia, and ammonium chloride is precipitated by adding ammonium chloride. After purification, it is calcined in hydrogen to obtain bismuth powder. The metal ingot can be obtained by powder metallurgy or by high-frequency induction furnace melting.

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